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• W2108809733 abstract "PcrA is an essential helicase in Gram-positive bacteria, but its precise role in cellular DNA metabolism is currently unknown. The Staphylococcus aureus PcrA helicase has both 5'-->3' and 3'-->5' helicase activities. In this work, we have studied the binding of S.aureus PcrA to a variety of DNA substrates that represent intermediates in DNA replication, repair, recombination and transcription. PcrA bound poorly or not at all to single-stranded DNA, double-stranded DNA with blunt ends, partially double-stranded DNA containing fork and bubble structures, and duplex DNA substrates containing either 5' or 3' single-stranded oligo dT tails. Interestingly, PcrA bound with high affinity to partially duplex DNA containing hairpin structures adjacent to a 6 nt long 5' single-stranded region and one unpaired nucleotide (flap) at the 3' end. However, PcrA did not detectably bind to partial duplexes with folded regions adjacent to a 6 nt long 3' single-stranded tail (with or without a 1 nt flap at the 5' end). PcrA showed moderate helicase activity with partially double-stranded DNAs containing 3' or 5' single-stranded oligo dT tails, the 3'-->5' helicase activity being more efficient than its 5'-->3' helicase activity. Interestingly, PcrA showed maximal helicase activity with substrates containing folded structures and 5' single-stranded tails, suggesting that its 5'-->3' helicase activity is greatly stimulated in the presence of specific structures. However, the 3'-->5' helicase activity of PcrA did not appear to be affected by the presence of folded substrates containing 3' single-stranded tails. Our data indicate that PcrA may recognize DNA substrates with specific structures in vivo and its 5'-->3' and 3'-->5' helicase activities may be involved in distinct cellular processes." @default.
• W2108809733 created "2016-06-24" @default.
• W2108809733 creator A5025654488 @default.
• W2108809733 creator A5089172747 @default.
• W2108809733 date "2004-06-02" @default.
• W2108809733 modified "2023-10-13" @default.
• W2108809733 title "Structure-specific DNA binding and bipolar helicase activities of PcrA" @default.
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• W2108809733 doi "https://doi.org/10.1093/nar/gkh641" @default.
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